Mortising and grooving machine.



LOUIS LUBIN, OF CLICHY, FRANCE.

M ORTISING 'AND GROOVING MACHINE.

Specification of Letters Patent.

' Patented July 21, 1908,.

Application led December 4, 1906, Serial No. 346,195.

T 0 all whom 'Li may concern.'

Be it known that l, LOUIS LUBIN, engineer, a citizen of the Republic ofFrance, residing at 21 Rue Martissot, Clichy, Seine, France, haveinvented certain new and useful lmprovements in and Relating toMortising and Grooving Machines, of which the following is aspecification.

The present invention relates to inortising and grooving machines andparticularly to the arrangement of the tool .holder shaft or of workholder carriage, the section of which is constituted by two parallelsunited by two semi-circumferences. This arrangement is represented inthe accompanying drawing, in which Figure 1 shows the application of theinvention. Fig. 2 is a front elevation of the mortise formed. Fig. 3shows a constructional form of machine which may be of any known kindand to which the invention is applied.

Mortising machines heretofore employed comprise a fixed shaft and amovable shaft which is displaced parallel with its axis. It follows thatwhen it is desired to form a mortise of small size, the tool being toofiexible tends to jump or chatter when it reaches cach end of itstravel. This chattering frequently causes the breakage of the tool, andin particular, owing to the flexion of the tool, conical mortises areformed.

The present invention has for its object means for obviating the defectspointed out above, and consists in the employment of a tool holder shaftc oscillating around a fixed point f (Fig. 1). The result of thismovement of oscillation is to present the tool g at each end of its oerative stroke at a certain cutting ano-le a w ich renders chatteringand its harmfu effects impossible, the rear portion of the tool beingalways free. In this manner a mortise 7i is obtained with absolutelyequal dimensions at the beginning and end. This rocking movement is alsoutilized for replacing the movement, of translation of the carriage onwhich the work is fixed. The same result may be obtained if the shaft isheld stationary, and a corresponding movement of oscillation be impartedto the work holding carriage, or any other movement insuringthe actionof the tool at a certain cutting angle at each end of its travel.

The present invention relates solely to imparting to the tool holdershaft in the case of a fixed carriage, or tothe work holder carriage inthe case ofa fixed shaft, a relative movement of oscillation such thatthe tool invariably acts at the end of the travel at a sufficient anglefor its heel to be out of contactwith the work. lt is independent of themechanisms employed for producing this movement, and of the accessoryarrangements resulting from the various applications.

The machine represented in Big. 3 comprises a shaft 1, in which the toolholder 2 carrying the tool 3 is fixed by any appropriate means. The part4 to be acted upon is held in a movable sup ort or vise 5 which may bedisplaced on the frame of the machine by an ordinary device comprising ascrew 6 and a nut 7.

The shaft 1 carries the driving pulley 8 and the head stock 9 carryingthis, shaft is mounted upon a support 10 in such a manner that it isable to slide therein. This support 1() terminates in a cylindricalbarrel 11 fitted into a recess of the same shape in the frame in such amanner that it is able to ro* .tate about its geometrical axis z-z.V Theshaft 1 terminates in an endless screw 12 which meshes with a helicoidalwheel 13 mounted upon a vertical shaft 14 ending at its lower part in aneccentric extension 15 supported in a step bearing 16. This latter ismovable in a groove 17 in the frame. The vertical shaft 14 is guided ina sleeve 18 forming one with the head stock 9, in order that theposition of the wheel 13 relatively to the screw 12 may remaininvariable 'Whatever the position of the headstock 9 maybe.

The operation is as follows :#-The rotation of the shaft 1 istransmitted by the interme diary of the endless Screw 12 and of thewheel 13 to the vertical shaft 14. As the eccentric pivot 15 of thisshaft is maintained fixed in the step bearing 16, the shaft 14, whilerotating` upon itself, is obliged to rotate eccentrically around theaxis of the pivot 15. As this shaft 14 is rigidly connected to theheadstock 9, and this latter is mounted upon the rotary support 10, itwill be understood that this headstock, and consequently the shaft 1,will assume an angular displacement around the axis z-z of the barrel 11which supports this assemblage. The angular displacement'of the toolwhich is shown in Fig. 2 is thus obtained. The amplitude of this angularmovement varies with the distance between the axis zfz of oscillation ofthe headstock and the axis of the pivot 15 held in the step bearing 16.

This amplitude may be caused to vary by producing the simultaneoussliding upon the frame of the headstook 9 With its back gear and thestep bearing 16. In this manner it is possible to determine the lineardisplacement of the tool point for any length of mortise to be cut.

It should be understood that the said invention is applicable not onlyto Wood Working but to the Working of metals or any other materials.

Having noW particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatWhat I claim is rl. In a mortising and grooving machine, a support, apivoted head stock, a revoluble tool carrying shaft mounted in the headstock, a Worm on the shaft, a Worm Wheel meshing With the Worm, and ashaft carrying the Worm Wheel and having an eccentric at one end mountedin a movable bearing in the support.

2. In a mortising and grooving machine, a support, a pivoted andslidable head stock,

a revoluble tool carrying shaft mounted in the head stock, a Worm on oneend of the shaft a Worm Wheel meshing With the Worm, and a shaft mountedin the head stock and having at one end an eccentric mounted in amovable bearing in the support.

3. In a mortising and grooving machine, a base frame having alongitudinal groove, a support pivoted upon the base frame, a head stockslidably mounted on the support, a revoluble shaft mounted in the headstock, a Worm on one end of the shaft, a shaft mounted in the head stockand having an eccentric extension at one end, a bearing movable in thegroove of the base frame and in which the eccentric extension of thesaid shaft is mounted, and a Worm Wheel on the other end of the shaftand meshing with the saidworm. In Witness whereof I have hereunto set myhand this 22nd day of November 1906.

LOUIS LUBIN.

In the presence of- HANsoN C. CoXE, ALBERT NUNEs.

